Cleaning device for radio tuning dials



Oct. 13, 1931. H. c. BAKER ET AL 1,326,715

CLEANING DEVICE FOR RADIO TUNING DIALS Filed Aug. 7/1930 2 Sheets-Sheet. 1

Il l l INVENTIORS HneoLoGBn/(EE 11 BY OscneAEoss d 730-. b ATTORNEY Oct. 13, 1931.

H. c. BAKER ET AL CLEANING DEVICE FOR RADIO TUNING DIALS Filed Aug. '7, 1930 2 Sheets-Sheer. 2

u m u W M Q Q Q Q N65 HHBOZD Y B 2 Oscne A-oss A TTORNEY Patented Oct. '13, 1931 UNITED STATES PA ENT oar-Ice 'nnaom c. namum cams. noes, or m "rent, 11.

came nnvrcn son mm rimme nuns Application mes Land 1, lerlal in. ms.

' This invention refers to cleaning devices.

. matter settling on the vernier face of tuning dials may be automatically cleaned there-- from as said dial is rotated during the tuning of said sets. 7 r

Another object is to furnish a cleaning device for radio dials of radioreceiving sets wherein the cleanin member arranged to sweep the vernier dia face thereof is rotated in a direction opposite to the rotation of the dial whereby'extraordinary sweeping action is obtained.

Another object is to furnish a cleaning device for tuning dials of radio receiving sets wherein the vernier dial face of said dials is automatically cleaned of dust and other foreign matter as said dial is ordinarily rotated for tuning the sets.

Another object is to furnish a cleaning device for tuning dials of radio receivin setswherein the portion of the vernier dia face being. advanced into the escutcheon or viewing opening therefor will be cleaned before moving to said opening irres ctive of the direction of rotation of said dial during the tuning of a set.

Another object is to furnish a cleaning device for tuning dials of radio receiving sets' which may be secured to the escutcheon member or cabinet portion independently of the removable chassis.

Another object is to furnish a cleaning device for tuning dials of radio receivin sets wherein the vernier dial face portion 0 said dials being advanced into view before a viewing opening of said sets will be cleaned before being so advanced into view, said cleaning device however being concealed from normal view during said cleaning operation.

Another object is to furnish'a cleaning device for tuning dials of radio receiving sets wherein the ressure of the cleaning member bearing on the vernier dial face of said dials will be balanced substantially equally over the entire face of said dials.

Other objects and advantages will appear as the description of the invention progresses and the novel features thereof are pointed out in the appended claims.

This invention consists in the novel construction and arrangement of parts hereinafter .described, delineated in the accompanying drawings and particularly pointed out in that portion of this instrument wherein atentable novelty is claimed for certain a'n peculiar features of the device it being understood that, within the scope of what hereinafter thus is claimed, divers chan in the form, proportions, size and minor etails may. be made without departing from the spirit of, or sacrificing any of the details of the invention.

In describing the invention in detail, reference is had to the accompanying drawings, wherein is illustrated embodiments of the invention, and, wherein like characters of reference refer to corresponding parts throughout the several views,.and in which r- A Figure 1 is a part sectional view through a radio receiving set of conventional form to which our improved form of cleaning device has been applied, and Fig. 2 is a part sectlonal, part plan view of the same taken on line 2-2 of ig. 1, and Fi 3 is a part elevational view of the same ta en on lme 3-3 of Fig. 1, and Fig. 4 is another part elevational view of the same taken on line 4-4 of Fig. 1,

and Fi 5 is a detailed enlarged sectional view 0 a portion of said device, and Fig. 6 v

is a sectional view of the same taken on line 6-6 of Fig. 5, and Fig. 7 is a plan view of a developed detail of said device, and Fig. 8

is a part sectional view of a radio receiving fied method of supporting the brush supporting member shown in Figs. 3 and 4, and Fig. 14 is an elevational view of a detailed part thereof taken on line 14l4 of Fig. 13 and Fig. is a part sectional view of a radio receiving set showing still another modified form of tuning dial cleaning device, and Figs. 16 and 17 are fragmental detailed views of a modified portion thereof.

Referring to Figs. 1, 2, 3, 4, 5, 6, and 7, the radio receiving set 1 is of conventional form comprising cabinet portion 2, having opening 3, arranged to receive escutcheon or viewing member 4 having rear viewing opening 5, positioned adjacent vernier dial face 6 of dial member 7 forming a part of chassis 8 arranged to be moved toward and away from said rear opening5 and guided by rails 8a, said dial face 6 being illuminated by lamp 9, whereby the radio broadcasting stations indicated by the vernier reading thereon may be Cpositioned relatively to the indicator 4a.

leaning device 10, comprises stationary hinge portion 11 secured to the upper face 12 of escutcheon member 4, said hinge portion being arranged to receive pin 13 for pivotally supporting brush supporting member 14 comprising bracket 15 formed from stamping 16, said bracket having hinge portions 17-17, bridge portion 18, and bearing portions 1919 arranged to rotatably support brush members 2020 comprising bristles 21 woven between wires 2222 having bearing caps 23 and 24 secured at each end thereof, cap 23 supporting friction roller 25 and cap 24 friction roller 26. Spring 27 supported by hinge pin 13 is normally arranged to restrain brush supporting member 14 away from opening 5 whereby brush members 20-20are arranged to frictionally engage the vernier face 6 of dial 7.

The operation of cleaning device 10 is as follows z-lVhen chassis 8 is removed from cabinet 2, the lower end of brush supporting member 14 is restrained to the right away from opening 5 by action of spring 27. When said chassis is returned to said cabinet and is moved to the left in rails 8a, friction roller 25 first engages dial member 7 whereafter further movement to the left of said chassis will finally restrain the peripheral edge of said dial to engage friction roller 26 and whereafter said chassis cannot be moved further to the left owing to the direct thrust against hinge pin 13. Said chassis is locked in position in known manner whereafter any movement of dial 7 will act to frictionally rotate rollers 25 and 26 whereupon brush members 202O are rotated, the difference in contact diameter between said brush members and friction rollers, as well as the spiral formation of said brush members, acting to produce a sweeping action on the vernier face 6 in this manner cleaning all dust or foreign matter therefrom.-

Referring to Fi s. 8, 9 and 10, the modified form of cleaning evice 30 is ada ted for use in radio receiving sets having a ial member as 31 formed with a cylindrical vernier face as 32 and driving tracks as 32a-32a on either side thereof. Said modified form of cleaning device comprises bracket member 33 secured to cabinet portion 2, said bracket being shown in developed form as member 34, (Fig. 10), said bracket member having base portion 35 and arms 36-36 arranged to rotatably support shaft 37 having friction rollers 38'- 38 and gears 3939 secured thereto, also to rotatably support shaft 40 having brush 41 and pinions 42-42 secured thereto, said pinions meshing with said gears and driven thereby.

Dial member 31 assumed to be supported bya chassis also assumed to be guided by rails as 8a in relation to cabinet portion 2, is

formed with tracks as 32a-32a preferably out of view of the opening 5, said tracks normally engaging friction rollers 3838 whereby rotation of said dial member will re strain rotation of said rollers in this manner causing gears 39-39 to rotate pinions 42-42 and brush member 41 in reverse direction to the rotation of said dial member whereby an extraordinary sweeping action is obtained between said brush member and the vernier surface 32 of said dial member. It is to be noted that when said chassis is removed said cleaning device 30 remains as a fixed portion of cabinet 2, further, as said chassis is returned to said cabinet and is moved to the left in rails 8a, the brush member 41 first contacts with vernier face 32, whereafter further movement acts to cause friction rollers 3838 to engage the tracks 32a32a in this manner establishing an initial pressure of said brush member against said vernier face.

Referring to Figs. 11 and 12 showing still another modified form of cleaning devices 50-50, said devices comprise spring clamp members 51 having channels 52 arranged to receive felt pads or cleaning members 53, the spring clip portions 54 acting to resiliently adjustably clamp said pads in position in said channels. Said devices 5050 are preferably rigidly secured to escutcheon member 4 in a manner hereinafter described.

When the radio receiving set includes a chassis having a bevel face type of dial member as 7, one each of said cleaning devices 50 is secured to each side portion 55 of escutcheon member 4 and said cleaning pads 53 are formed with a bevel edge as shown by the full lines of Fig. 12. However when said chassis includes a dial member having a cylindrical formed vernier face as 32, a rectangular form of pad 53 as shown by the dotted lines of Fig. 12, is employed and said cleaning devices are secured to the top and bottom portions 12 and 12a of said escutcheon member.

Referring to Figs. 13 and 14 showing still eeann another modified form of cleanin 4 shown in Figs. 1 to 7 inclusive, said device to engage one end of tension spring 81 to the right,

comprises a brush supporting member 61 similar to member 14 however, havin' hinge portions 17'17 omitted and being urther modified by the addition of stud members 6262 having stop ortions 63-63 allocated by orifice 64a in b formed on bracket member 65 secured to cabinet 2, springs 66-66 acting to restrain said brush member 61 in the direction of vernier face 6 of dial member 7. The operation of cleaning device 60 is. substantially the same as that of device 10.

Referring to Fig. 15, showing still another modified form of cleaning device 70 for tuning dials of radio receiving sets, said device comprises bearing member 71 secured to cabinet 2, saidmember rotatably supporting shaft 72 having operatin handle 73 secured to one end thereof and c eaning brush member 74 secured to the other end thereof, said brush member comprising disk portion 75 formed integrally with comcal ortion 76 having ori fices 7 7-7 7 supportingqirush bristles 7 8-78, said conical portion having a cut-away portion 79 to normallypermit viewing dial face 6 through opening 5. Cleaning brush member 74 is formed with eye portion 80 arrarlixged aving the other end thereof secured to stud 82 supported by cabinet 2. Spring 83 supported by shaft 7 2 is normally arranged to restrain handle 73 and cleaning brush member 74 to the left away from vernier face 6 of dial member 7.

The operation of cleaning device 70 is as follows :The various brushes 7 87 8 substantially encircle the vernier face 6 of dial member but normally do not engage said surface. When it is desired to clean said vernier face the handle 73 is depressed inwardly or thereby compressing spring 83 and moving cleaning brush member 74 to the right whereby brushes, 7 8-7 8 engage said vernier face exceptthe viewed portion exposed to opening 5. After depressing said handles as described it is also rotated through an arc of a circle in each direction, said brush member passing through the opening, or

space 5a, in this manner cleaning the entire vernier face at one time. When handle 73 is released said handle and brush member 74 1 moves to the left away from said vernier face and as said handle is free to, rotate without restraint, spring 81 acts to center said brush member whereby the cut-away portion 79 registers with said viewing opening5.

Referring to Figs. 16 and 17, showing a modified form of cleaning member for substitution for the cleaning member 74 of Fig. 15, dial member com rises the disk portion 91 supported by sha t 72, said disk portion having an attachment portion or rim 91o ar- I device 60,

racket portions 64-64 .in the set during ranged to support felt pads, or cleaning projections 92--92 having the opening 79-'-79 formed therebetween said pads being secured by rivets 93-93. The modified form of cleaning member 90 has the advantage that it may be emplo ed for cleaning the vernier faces of tunin dial havin said faces at varying angles t ereon, sai pads bein flexible and therefore capable of accomm atin itself to various angles of inclination thereo It has thefurther' advantage that any one of the openings as 79 may be em with the view opening 5 w member is not in use. I

It is to be understood that the cleaning members as 74 and 90-are arranged to have the cleaning portions thereof pass through the passageway 5a between the escutheon 4 and the vernier face 6 of dial member 7.

What we claim is en said cleaning loyed to register 5 ing set comprising a housing having a chassi ositioned therein, the housing having a View ing 0 ning formed therein and the chassis inclu in face indicating radio broadcasting stations formed thereon positioned to be viewed through 'the opening for selectively tuning the movement of the dial member, of means positioned within the housing arranged to frictionally en age the dial member for effecting cleaning 0 the dial face thereof whereby the face will appear as dust free as it. is moved before the viewing opening during the movement of the dial member.

2. The combination with a radio receiving set comprising a housing having a chassis po sitioned therein, the housing having a viewing opening formed therein and the chassis including a timing dial member having a dial face indicating radio broadcasting formed thereon positioned to be viewed through the OPGDIIIgfOI selectively tunin in the set during the movement of the dia member, of a cleaning device associated with the set, and a cleaning member supported thereby arranged to frictionally engage the dial member for effecting cleaning of the dial face whereby the face will appear dust free as it is moved before the viewing opening during the movement of the dial member.

3. The combination with a radio receiving set comprising a housing having a chassis positioned therein, the housing having a viewin opening formed therein and the chassis inc uding a tuning dial member having a dial face indicating radio broadcasting stations formed thereon ositioned to be viewed through the opening or selectively tuning in the set during the movement of the dial member, of a cleaning device comprising, a frictional member positioned to engage the dial member and be actuated thereby as the dial is moved, and means actuated by the friction memberarranged to frictionally engage the a tuning dial member having a dial stations 7 face the for removing r, n y the dust tnererrore n on actuation of the inc- 0 I a v 1 tron member by the movement or the die -I memo The combination with a radio receivin T .v 5 mg ancnsmg having a chassis porein housing having a viewformed therein and the chassis incinc g s tuning diei member having a diei face iice-ting radio broadcasting stations .eOYPQECi reon ositioned to be viewed through be open g for seiectiveiy tuning the set during the movement of the. dial member, of means positioned within the iconserrenge. to r siiientiy frictionaiiy engage the dial member for effecting the cleaning of the dial face therwf whereby the face Wiii appear as dust free as it is moved before the opening during the movement of the diai member. 7

5. The combination with a radio receiving set comprisin a housing having a chassis positioned @161911'1 the housing having a viewing opening formed therein and the chassis inciuding a tuning diai member having a diai fsce indicating radio broadcasting stations formed thereon positioned to be viewed through the opening for selectiveiy tuning in the set during the movement of the dial member, of a cleaning device associated with the set, and a cleaning member supported thereby arranged to resilientiy frictionally engage the dial member for efiec-ting cleaning of the dial face thereof whereby the face will appear as dust free as it is moved before the viewing 0 ning during the movement of the dial memi ifr.

6. The combination with a radio receiving sci; com rising a housing having a chassis positionef therein, the housing having a viewing opening formed therein and the chassis including a dial member having a dial face indicating radio broadcasting stations formed thereon positioned to be viewed through the opening for selectively tuning in the set during the movement of the dial member, of a cieanin device comprising, a friction member osltioned to resiliently engage the dial mem r and be actuated thereby as the dial member is moved, and means actuated by the friction member arranged to frictionally engage the-dial face of the dial member for removing the dust therefrom upon actuation of the friction member by the movement of the dial member.

In testimony whereof We hereby aflix our signatures.

HAROLD O. BAKER. OSCAR A. ROSS. 

